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      015-Android自定义View(10)：手势监听&处理
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        <a href="/tags/Android自定义View/" class="post-meta-link">Android自定义View</a>
      
      
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        <a href="/tags/Android手势/" class="post-meta-link">Android手势</a>
      
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    <p> <a target="_blank" rel="noopener" href="https://blog.csdn.net/Cupster/article/details/112988157">【5年Android从零复盘系列之十五】Android自定义View(10)：手势监听&amp;处理</a></p>
<hr/>

<h1 id="1-基础"><a href="#1-基础" class="headerlink" title="1.基础"></a>1.基础</h1><p>了解自定义view事件分发处理机制，请参考<a target="_blank" rel="noopener" href="https://blog.csdn.net/Cupster/article/details/112900623">Android自定义View(9)：事件分发&amp;处理</a></p>
<br />

<h1 id="2-手势简介"><a href="#2-手势简介" class="headerlink" title="2. 手势简介"></a>2. 手势简介</h1><ol>
<li><p>GestureDetector是手势监听类，能够监听手指接触屏幕后的一系列动作：按下、短按、长按、滑动、单指抬起等；</p>
</li>
<li><p>ScaleGestureDetector是缩放手势监听类，能够监听多指缩放事件，用法与GestureDetector基本一致；</p>
</li>
<li><p>GestureDetector有两个监听接口，分别是OnGestureListener，OnDoubleTapListener，分别在构造函数中、setOnDoubleTapListener（）设置，用于获取对应事件序列回调；</p>
</li>
<li><p>长按手势需单独设置开启监听，才会回调对应事件方法：mGestureDetector.setIsLongpressEnabled(true)</p>
</li>
<li><p>缩放手势一般只处理onScale()</p>
</li>
</ol>
<h1 id="3-GestureDetector使用三部曲"><a href="#3-GestureDetector使用三部曲" class="headerlink" title="3. GestureDetector使用三部曲"></a>3. GestureDetector使用三部曲</h1><p>具体用法解释及注意点请看代码备注</p>
<img src="https:/ srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="https://gitee.com/cupster/picbed/raw/master/uPic/20210122153900_bU7AI9.png" class="lozad post-image"/gitee.com/cupster/picbed/raw/master/uPic/20210122153900_bU7AI9.png"/>


<img src="https:/ srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="https://gitee.com/cupster/picbed/raw/master/uPic/20210122153706_Jan-22-2021%2015-35-50.gif" class="lozad post-image"/gitee.com/cupster/picbed/raw/master/uPic/20210122153706_Jan-22-2021%2015-35-50.gif"/>

<h2 id="3-1初始化"><a href="#3-1初始化" class="headerlink" title="3.1初始化"></a>3.1初始化</h2><p>在需要监听手势的View 或者 Activity中，声明对象、初始化</p>
<pre class="highlight"><span class="line"><span class="comment">//1.声明</span></span><br><span class="line">GestureDetector mGestureDetector;</span><br><span class="line"><span class="comment">//2.初始化</span></span><br><span class="line">mGestureDetector = <span class="keyword">new</span> GestureDetector(<span class="keyword">this</span> ,<span class="keyword">this</span>);</span><br><span class="line">mGestureDetector.setOnDoubleTapListener(<span class="keyword">this</span>);</span><br><span class="line">mGestureDetector.setIsLongpressEnabled(<span class="keyword">true</span>);<span class="comment">//允许长按</span></span><br><span class="line"><span class="comment">//3.对应的类实现接口GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener</span></span><br><span class="line">...</span><br></pre>

<h2 id="3-2触摸事件交接"><a href="#3-2触摸事件交接" class="headerlink" title="3.2触摸事件交接"></a>3.2触摸事件交接</h2><pre class="highlight"><span class="line"><span class="comment">//重写View或Activity的onTouchEvent()</span></span><br><span class="line"><span class="meta">@Override</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onTouchEvent</span><span class="params">(MotionEvent event)</span> </span>&#123;</span><br><span class="line">    mGestureDetector.onTouchEvent(event);</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">&#125;</span><br></pre>

<h2 id="3-3接口回调方法中实现需求功能"><a href="#3-3接口回调方法中实现需求功能" class="headerlink" title="3.3接口回调方法中实现需求功能"></a>3.3接口回调方法中实现需求功能</h2><pre class="highlight"><span class="line"><span class="comment">//===============================================================================</span></span><br><span class="line"><span class="comment">//=========================== OnDoubleTapListener的方法回调 =========================</span></span><br><span class="line"><span class="comment">//===============================================================================</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onSingleTapConfirmed</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onSingleTapConfirmed &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;单击事件\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onDoubleTap</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onDoubleTap: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;双击事件\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onDoubleTapEvent</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onDoubleTapEvent: &quot;</span> );</span><br><span class="line">        <span class="comment">//双击间隔中间的event回调</span></span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"><span class="comment">//===============================================================================</span></span><br><span class="line"><span class="comment">//=========================== OnGestureListener的方法回调 =========================</span></span><br><span class="line"><span class="comment">//===============================================================================</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onDown</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onDown: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;====================\n&quot;</span>);</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：按下\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onShowPress</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onShowPress: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：短按屏幕\n&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onSingleTapUp</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onSingleTapUp: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：单指抬起\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onScroll</span><span class="params">(MotionEvent motionEvent, MotionEvent motionEvent1, <span class="keyword">float</span> v, <span class="keyword">float</span> v1)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onScroll: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：手指滑动\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">false</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onLongPress</span><span class="params">(MotionEvent motionEvent)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onLongPress: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：长按\n&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// velocityX：X轴方向速度，单位px/s</span></span><br><span class="line">    <span class="comment">// velocityY：Y轴方向速度，单位px/s</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onFling</span><span class="params">(MotionEvent motionEvent, MotionEvent motionEvent1, <span class="keyword">float</span> velocityX, <span class="keyword">float</span> velocityY)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onFling: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：手指划飞\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br></pre>

<h1 id="4-ScaleGestureDetector使用"><a href="#4-ScaleGestureDetector使用" class="headerlink" title="4.ScaleGestureDetector使用"></a>4.ScaleGestureDetector使用</h1><p>具体细节&amp;主要要点留意代码注释</p>
<img src="https:/ srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="https://gitee.com/cupster/picbed/raw/master/uPic/20210122155925_Jan-22-2021%2015-59-01.gif" class="lozad post-image"/gitee.com/cupster/picbed/raw/master/uPic/20210122155925_Jan-22-2021%2015-59-01.gif"/>


<h2 id="4-1初始化"><a href="#4-1初始化" class="headerlink" title="4.1初始化"></a>4.1初始化</h2><pre class="highlight"><span class="line"><span class="comment">//1.声明</span></span><br><span class="line">ScaleGestureDetector mScaleGestureDetector;</span><br><span class="line"><span class="comment">//2.初始化</span></span><br><span class="line">mScaleGestureDetector = <span class="keyword">new</span> ScaleGestureDetector(<span class="keyword">this</span> ,<span class="keyword">this</span>);</span><br><span class="line"><span class="comment">//3.所在对应类实现接口OnScaleGestureListener</span></span><br></pre>

<h2 id="4-2事件交接"><a href="#4-2事件交接" class="headerlink" title="4.2事件交接"></a>4.2事件交接</h2><pre class="highlight"><span class="line"><span class="meta">@Override</span></span><br><span class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onTouchEvent</span><span class="params">(MotionEvent event)</span> </span>&#123;</span><br><span class="line">      mGestureDetector.onTouchEvent(event);</span><br><span class="line">      mScaleGestureDetector.onTouchEvent(event);</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">  &#125;</span><br></pre>

<h2 id="4-3回调处理"><a href="#4-3回调处理" class="headerlink" title="4.3回调处理"></a>4.3回调处理</h2><pre class="highlight"><span class="line"></span><br><span class="line"><span class="comment">//===============================================================================</span></span><br><span class="line"><span class="comment">//=========================== OnScaleGestureListener的方法回调 =========================</span></span><br><span class="line"><span class="comment">//===============================================================================</span></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onScale</span><span class="params">(ScaleGestureDetector scaleGestureDetector)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onScale: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：缩放ing\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">onScaleBegin</span><span class="params">(ScaleGestureDetector scaleGestureDetector)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onScaleBegin: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：缩放begin\n&quot;</span>);</span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onScaleEnd</span><span class="params">(ScaleGestureDetector scaleGestureDetector)</span> </span>&#123;</span><br><span class="line">        Log.e(TAG, <span class="string">&quot;onScaleEnd: &quot;</span> );</span><br><span class="line">        mTvStatus.append(<span class="string">&quot;序列事件：缩放end\n&quot;</span>);</span><br><span class="line">    &#125;</span><br></pre>

<h1 id="5-实践"><a href="#5-实践" class="headerlink" title="5.实践"></a>5.实践</h1><p>手势监听&amp;处理的最佳实践：<a target="_blank" rel="noopener" href="https://blog.csdn.net/Cupster/article/details/112988311">实现自定义ImageView</a></p>
<ol>
<li>双指缩放</li>
<li>拖拽移动</li>
<li>点击事件回调（查看大图的Activity中可以finish）</li>
<li>双击事件回调，图片复原</li>
</ol>
<h1 id="6-布局等其他代码"><a href="#6-布局等其他代码" class="headerlink" title="6.布局等其他代码"></a>6.布局等其他代码</h1><pre class="highlight"><span class="line"><span class="meta">&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">RelativeLayout</span> <span class="attr">xmlns:android</span>=<span class="string">&quot;http://schemas.android.com/apk/res/android&quot;</span></span></span><br><span class="line"><span class="tag">    <span class="attr">android:layout_width</span>=<span class="string">&quot;match_parent&quot;</span></span></span><br><span class="line"><span class="tag">    <span class="attr">android:layout_height</span>=<span class="string">&quot;match_parent&quot;</span>&gt;</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &lt;TextView</span><br><span class="line">        android:id=&quot;@+id/tv_status&quot;</span><br><span class="line">        android:layout_centerInParent=&quot;true&quot;</span><br><span class="line">        android:layout_width=&quot;wrap_content&quot;</span><br><span class="line">        android:layout_height=&quot;wrap_content&quot;</span><br><span class="line">        android:text=&quot;手势监听&quot;</span><br><span class="line">        /&gt;</span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">RelativeLayout</span>&gt;</span></span><br></pre>
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